In this specification, including the synergistic herbicidally effective amount of (a) aminopyralid or an agriculturally acceptable salt or ester and (b) clopyralid or an agriculturally acceptable salt or ester, It discloses a herbicidal composition. Further provided herein is a method of controlling undesired plants, in order to prevent the emergence or growth of vegetation, (a) aminopyralid or an agriculturally acceptable salt or ester and (b) clopyralid, or, and agriculturally acceptable salts or esters, comprising the step of applying the step or soil or water application to the area adjacent to the plant or plants, (a) and (b), respectively, the synergistic herbicidal effect added in an amount sufficient to generate, discloses a method.
